22
TB MRD1-G 11.01 E
5.1.5
VIEW mode / EDIT mode
There are two modes for selecting PARAMETER pages:
A short press on the PARA-key activates the VIEW-mode.
The EDIT-mode can be selected by pressing the PARA-
key for approx. 2 s (long press).
•
VIEW mode (viewing)
On pressing the key this mode only allows viewing the
active parameters
•
EDIT mode (processing)
Unlike in mode VIEW, in EDIT mode one of the four
parameter sets can be selected. That parameter set is
then copied automatically into the EDIT memory and
can be viewed there. At the first attempt of changing
a parameter, the password is requested. After entering
the password (LED EDIT lights up if the password was
correct), the parameter can be changed. For any fur-
ther change of parameter(s) the password is not re-
quested again. In case the user does not know the
password, the password entering mode can be can-
celled and still parameter sets be viewed but as ex-
plained above, they cannot be changed.
It is not necessary to acknowledge any change sepa-
rately by pressing the ENTER key since at first every-
thing is processed in the EDIT memory only. Each of
the changes can be cancelled again. LED MODIFIED
indicates that the parameter displayed was changed.
If it should be set back to the initial value, only brief
actuation of key RESET (cancel function) is needed. If
the process is closed (with: ENTER, long), all the
changes can be rejected again or be accepted.
(Checkback: ARE YOU SURE?). Before the parameter
set ist finally stored an internal plausibility check is per-
formed to ensure that all settings are conclusive. If the
check routine detects a irresolute combination of set-
tings, the user will be informed and the settings are not
stored. e.g. an unsuitable combination of generator
rated current (which is calculated from rated voltage
and power capacity setting) an the setted CT primary
rated current.
The protection program executed in the
MRD1
at the
time is not effected by this procedure. Values of the ac-
tive parameter sets filed in the PARAMETER memory are
still being used until the complete EDIT memory is recop-
ied into the respective PARAMETER memory. Only then
all changes made taking effect together in the protection
program.
!
Note
Note
Note
Note
If during processing the aux. voltage fails, the complete
EDIT memory is erased. After aux. voltage has returned,
the protection program starts with those settings which
were stored in the PARAMETER memory before the last
processing operations. By this it is ensured that the pro-
tection program does not work with incompletely
changed data or meaningless data.
If due to the continously running check-sum test data er-
ror or loss of parameter memory is noted during start-up
of the relay or during operation, a default parameter is
loaded automatically. In such case the relay changes to
the Offline mode (see next chapter) and the self-
supervision relay de-energizes.
The EDIT-mode is left automatically if there is no input
longer than 10 minutes (time out). Changed parameters
wil not be stored.
